SRAM Red Rear DerailleurThe best of Sram's latest and greatest group is the Sram Red 22 Rear Derailleur. Tuned to work with an 11-speed cassette, bringing the total amount of gear choices to an astounding 22, the Red 22 Rear Derailleur allows you to find the best possible cadence for all riding conditions. With Exact Actuation, not only do you get a system that is incredibly easy to set up but also one that is easy and more natural to use, with a 1:1 ratio of derailleur movement to cable pull, and one that remains consistent for longer. Not only is the shifting faster and more precise but the entire system is quieter. With optimized Aeroglide Pulleys and ceramic bearings it is an eerily quiet shifting experience. The improvements just keep coming. With more clearance with 28t cassettes thanks to a longer B-knuckle, titanium hardware and redesigned pulley cage and barrel adjuster you are looking at the cutting edge in shifting technology.